Thomas de Ros, born 26 September 1406, was the second son of William de Ros, 6th Baron de Ros, and Margaret Fitzalan (d 3 July 1438), the daughter of John FitzAlan, 1st Baron Arundel, by Eleanor Maltravers (c1345 – 12 January 1405), younger daughter and coheir of Sir John Maltravers (d 22 January 1349).
Thomas de Ros was a younger brother of John de Ros, 7th Baron de Ros, who died childless at the Battle of Beaugé on 22 March 1421. He fought in the Battle of Verneuil under the command of John, Duke of Bedford. He was honored for his efforts, knighted by Henry VI of England on 19 May 1426.
Henry was nephew of the Duke.
Thomas resumed service under the Duke in 1427. He was summoned to the Parliament of England in 1429.
In 1430 he fell into the Seine during a minor skirmish and was drowned.
